Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 29, 2012 USD ($) Contract	Dec. 31, 2011 USD ($) Contract	Dec. 25, 2010 USD ($)	Dec. 31, 2011 SEK
Summary of Significant Accounting Policies (Textual) [Abstract]
Highly liquid short-term investments maturity date	Three months or less
Sale of Accounts Receivable	$ 312,700,000	$ 208,800,000	$ 104,300,000
Additional receivables outstanding if receivables had not been sold	180,500,000	137,000,000
Factoring costs associated with the sales of accounts receivable	4,400,000	3,500,000	2,000,000
Impairment charges of other assets before income taxes	1,000,000
Research and development costs	10,500,000	8,600,000	4,600,000
Net accounts receivable from five largest customers	86.00%	83.00%
Percentage of products purchased from foreign suppliers	80.00%
Number of foreign exchange forward contracts outstanding	0	2
Sale of foreign exchange forward contract				10,000,000
Cash received from sale of forward contract		1,400,000
Fair value liability of forward contracts		$ 13,000